<!DOCTYPE html>
<html>
<head>
<style>
.fake-p-test-container{
  color: black;
}
.fake-p-test {
  display: none;
  background-color: yellow;
  padding: 20px;
}

.fake-p-test-container:hover .fake-p-test {
  display: block;
}

</style>
</head>
<body>

<div class="fake-p-test-container">鼠标移到我上面来显示 p 元素
  <p class="fake-p-test ">哈哈！我在这里！</p>
</div>

</body>
</html>

